Question

four 1 litre flask are separately filled with the gases H2 Helium O2 and O3 at the same temperature and pressure the ratio of total number of atoms of these gases present in different flask could be

Answer 1

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According to Avogadro's hypothesis equal volumes of all gases under similar condition of temperature and pressure contains equal number of molecules.
Hence number of atom of H2,He,O2, and O3 will be in the ratio 2:1:2:3
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Answer 2

Let n be the number of moles of each gas present in 1L at a particular temperature and pressure. It will be same for all the gases as all variables pressure, temperature and volume are same.
Number of molecules of all gases present will be = moles

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 Avogadro number = nNA
This will be same for all gases
Number of atoms /molecule are two for H2and O2  and so number of atoms present= 2nNA
Number of atoms /molecule is three for O3 and so number of atoms present= 3nNA
Number of atoms /molecule is one for  He  and so number of atoms present= nNA
Ratio of atoms in H2, He, O2 and O3  is  2nNA: nNA2nNA: 3nNA  or  2:1:2:3

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